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Tuning La2O3 to high ionic conductivity by Ni-doping.

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Nickel-doped lanthanum oxide (La2O3) shows promise as an ionic conducting membrane for fuel cells. Doping enhances conductivity and power density by increasing oxygen vacancies and tuning electronic properties.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • Lanthanum oxide (La2O3) is a wide-band gap semiconductor with potential for ionic conduction.
  • Developing efficient ionic conducting materials is crucial for advancing fuel cell technology.

Purpose of the Study:

  • To develop and characterize Ni-doped La2O3 as an ionic conducting membrane.
  • To investigate the mechanisms behind performance enhancement in Ni-doped La2O3.
  • To evaluate its potential for fuel cell applications.

Main Methods:

  • Synthesis of Ni-doped La2O3 membranes.
  • Electrochemical impedance spectroscopy to measure ionic conductivity.
  • X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy for material characterization.
  • Density functional theory (DFT) calculations to understand electronic structure.
  • Fuel cell testing to determine power density and open circuit voltage.

Main Results:

  • Achieved ionic conductivity of 0.187 S cm-1 at 550 °C with Ni-doped La2O3.
  • Attained a peak power density of 970 mW cm-2 and an open circuit voltage of 1.05 V.
  • Identified high oxygen vacancy concentration as key to performance enhancement.
  • DFT calculations confirmed Ni doping tunes the band structure for improved electrochemical performance.
  • Formation of a Schottky junction barrier at the anode/electrolyte interface facilitated ionic transport.

Conclusions:

  • Ni-doped La2O3 demonstrates excellent ionic conducting properties suitable for fuel cells.
  • Oxygen vacancies and tailored electronic band structure are critical for enhanced performance.
  • Wide-band gap semiconductors can be engineered for advanced ionic conductor applications through doping.